.about{
    background:#0b1729;
    .aboutus{
        margin:130px auto 0 auto;
        @media only screen and (min-width: 1200px){
            ul{
                margin-top:40px;
                list-style: none;
                margin-left:130px;
                li{
                    width:1080px;
                    display: table;
                    margin-top:60px;
                    overflow: visible;
                    .left{
                        cursor: pointer;
                        width: 640px;
                        height: 360px;
                        background-color: #112037;
                        float:left;
                    }
                    .mask{
                        position:relative;
                        background: linear-gradient(299deg, #00d2d7, rgba(179, 255, 243, 0.0));
                        .video{
                            display: none;
                            position:absolute;
                            width:100%;
                            height:100%;
                            top:0;
                            left:0;
                        }
                        .start{
                            position:absolute;
                            top:271px;
                            right:78px;
                            cursor: pointer;
                        }
                        span{
                            position:absolute;
                            top:315px;
                            right:38px;
                            font-size: 18px;
                            color:white;
                        }
                    }
                    .right{
                        width: 440px;
                        height: 360px;
                        float:left;
                        position: relative;
                        .top{
                            display: inline-block;
                            margin:85px auto auto 42px;
                            width: 356px;
                            height: 50px;
                            font-size: 34px;
                            line-height: 50px;
                            color: #2e4972;
                        }
                        hr{
                            display: none;
                        }
                        .bottom{
                            -webkit-font-smoothing: antialiased;
                            display: inline-block;
                            width: 317px;
                            height: 50px;
                            font-size: 16px;
                            line-height: 1.5;
                            color: #2e4972;
                            position:absolute;
                            left:42px;
                            bottom:90px;
                        }
                        .animat_icon{
                            display: none;
                        }
                        &:hover{
                            animation: show 2s;
                            background-color: #223655;
                            .top{
                                color:#ffffff;
                            }
                            hr{
                                border:0;
                                display: block;
                                width: 120px;
                                height: 4px;
                                background-color: #b3fff3;
                                margin:30px auto auto 42px;
                            }
                            .bottom{
                                display: inline-block;
                                width: 317px;
                                height: 50px;
                                font-size: 16px;
                                line-height: 1.5;
                                color: #ffffff;
                                position:absolute;
                                left:42px;
                                bottom:90px;
                            }
                            .animat_icon{
                                position:absolute;
                                top:-110px;
                                right:-110px;
                                display: block;
                                width:240px;
                                height:240px;
                                overflow: visible;
                                img{
                                    width:240px;
                                    height:240px;
                                    position:absolute;
                                    top:0;
                                    left:0;
                                }
                                img:nth-child(1){
                                    top:30px;
                                }
                                img:nth-child(2){
                                    animation: rotate_icon 5s linear infinite,show 1s;
                                }
                            }
                        }
                    }
                    .right_null{
                        background:#0b1729;
                    }
                }
            }
        }

        @media  screen and (min-width: 960px) and (max-width:1200px){
            ul{
                margin-top:40px;
                list-style: none;
                margin-left:130px;
                li{
                    width:800px;
                    display: table;
                    margin-top:60px;
                    overflow: visible;
                    .left{
                        cursor: pointer;
                        width: 400px;
                        height: 260px;
                        background-color: #112037;
                        float:left;
                    }
                    .mask{
                        position:relative;
                        background: linear-gradient(299deg, #00d2d7, rgba(179, 255, 243, 0.0));
                        .video{
                            display: none;
                            position:absolute;
                            width:100%;
                            height:100%;
                            top:0;
                            left:0;
                        }
                        .start{
                            position:absolute;
                            bottom:58px;
                            right:78px;
                            cursor: pointer;
                        }
                        span{
                            position:absolute;
                            bottom:25px;
                            right:38px;
                            font-size: 18px;
                            color:white;
                        }
                    }
                    .right{
                        width: 360px;
                        height: 260px;
                        float:left;
                        position: relative;
                        .top{
                            display: inline-block;
                            margin:65px auto auto 32px;
                            width: 320px;
                            height: 50px;
                            font-size: 34px;
                            line-height: 50px;
                            color: #2e4972;
                        }
                        hr{
                            display: none;
                        }
                        .bottom{
                            -webkit-font-smoothing: antialiased;
                            display: inline-block;
                            width: 317px;
                            height: 50px;
                            font-size: 16px;
                            line-height: 1.5;
                            color: #2e4972;
                            position:absolute;
                            left:32px;
                            bottom:50px;
                        }
                        .animat_icon{
                            display: none;
                        }
                        &:hover{
                            animation: show 2s;
                            background-color: #223655;
                            .top{
                                color:#ffffff;
                            }
                            hr{
                                border:0;
                                display: block;
                                width: 120px;
                                height: 4px;
                                background-color: #b3fff3;
                                margin:30px auto auto 32px;
                            }
                            .bottom{
                                display: inline-block;
                                width: 317px;
                                height: 50px;
                                font-size: 16px;
                                line-height: 1.5;
                                color: #ffffff;
                                position:absolute;
                                left:32px;
                                bottom:50px;
                            }
                            .animat_icon{
                                position:absolute;
                                top:-110px;
                                right:-110px;
                                display: block;
                                width:240px;
                                height:240px;
                                overflow: visible;
                                img{
                                    width:240px;
                                    height:240px;
                                    position:absolute;
                                    top:0;
                                    left:0;
                                }
                                img:nth-child(1){
                                    top:30px;
                                }
                                img:nth-child(2){
                                    animation: rotate_icon 5s linear infinite,show 1s;
                                }
                            }
                        }
                    }
                    .right_null{
                        background:#0b1729;
                    }
                }
            }
        }
        
         @media only screen and (max-width: 960px){
             ul{
                margin-top:40px;
                list-style: none;
                li{
                    margin:30px auto 0 auto;
                    padding-left:30px;
                    padding-right:30px;
                    max-width:500px;
                    .left{
                        width:100%;
                        height: 220px;
                        background-color: #112037;
                    }
                    .mask{
                        position: relative;
                        background: linear-gradient(299deg, #00d2d7, rgba(179, 255, 243, 0.0));
                        .video{
                            display: none;
                            position:absolute;
                            width:100%;
                            height:100%;
                            top:0;
                            left:0;
                        }
                        .start{
                            position:absolute;
                            left:50%;
                            margin-left:-15px;
                            top:50%;
                            margin-top:-17px;
                        }
                        span{
                            display: none;
                        }
                    }
                    .right{
                        background-color: #223655;
                        position: relative;
                        padding:16px;
                        span{
                            display: block;
                        }
                        .top{
                            display: inline-block;
                            height: 30px;
                            font-size: 18px;
                            line-height: 30px;
                            color: #ffffff;
                        }
                        hr{
                            border:0;
                            width: 120px;
                            height: 4px;
                            background-color: #b3fff3;
                            position: absolute;
                            top:45px;
                        }
                        .bottom{
                            font-size: 12px;
                            line-height: 1.5;
                            color: #ffffff;
                            margin-top:20px;
                        }
                        img{
                            display: none;
                        }
                    }
                    .right_null{
                        background:#0b1729;
                        color:#2e4972;
                    }
                }
            }
         }
    }
    .doing{
        margin:30px auto 0;
        overflow:auto;
        
        @media only screen and (min-width: 960px){
            .bottom{
                margin: 40px auto 100px 130px;
                overflow: auto;
                .item{
                    width:50%;
                    float:left;
                    div{
                        position: relative;
                        i{
                            display: inline-block;
                            width: 6px;
                            height: 28px;
                            border-radius: 16px;
                            background-color: #b3fff3;
                            margin-right:10px;
                            position: absolute;
                            top:4px;
                        }
                        span{
                            margin-left:16px;
                            height: 33px;
                            line-height: 33px;
                            font-size: 22px;
                            color: #ffffff;
                        }
                    }
                    .pics{
                        width:90%;
                        margin:82px auto auto 16px;
                        overflow: auto;
                        margin-left:-2%;
                        text-align:center;
                        li{
                            width:33%;
                            float:left;
                            img{
                                width:100px;
                                height:100px;
                            }
                            span{
                                margin-top:30px;
                                display: block;
                                text-align: center;
                                font-size: 16px;
                                color:#fff;
                            }
                        }
                    }
                }
            }
        }
        @media only screen and (max-width: 960px){
            .bottom{
                margin: 40px auto 120px 30px;
                overflow: visible;
                .item{
                    div{
                        position: relative;
                        i{
                            display: inline-block;
                            width: 6px;
                            height: 20px;
                            border-radius: 16px;
                            background-color: #b3fff3;
                            margin-right:10px;
                            position: absolute;
                            top:6px;
                        }
                        span{
                            margin-left:16px;
                            height: 33px;
                            line-height: 33px;
                            font-size: 16px;
                            color: #ffffff;
                        }
                    }
                    .pics{
                        width:100%;
                        margin:32px auto 50px -14px;
                        overflow: auto;
                        text-align:center;
                        li{
                            width:33%;
                            float:left;
                            img{
                                width:60px;
                            }
                            span{
                                margin-top:30px;
                                display: block;
                                text-align: center;
                                font-size: 16px;
                                color:#fff;
                            }
                        }
                    }
                }
            }
        }
    }
}